Load-distributing apparatus.



H. A. LAYCOCK.

LOAD DISTRIBUTING APPARATUS.

APPLIUATION FILED 00T. 2, 1912.

1,096,930. Patent-,eq Majw, 1914,

Hf? ITTURNEX parallel with] a direct current generator.

' converter. In connection with the aforesaid `new anduseful Improvement-s in Load-Distributing Apparatus, of which the following correct variations from a predetermined vdisto one of the machines.

.leads of the respective machines for control- YUNITED STATES PATENT OFFICE.

HABBY A. LAYCOCK, 0F SCHENECTADY', NEW YORK, ASSIGNOB TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

LOAD-Disfrarnn'rme APPARATUS.

Specification of Letters Patent.

Patented May 19, 1914.

To'all whoml it'may concern.' v i ABe it known that I, HARRY A. LAYoooK, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain is a specification.

My invention relates to means for automatically securing the proper distribution of load upon two dynamo electric machines connected in parallel. l

More particularly my invention relates to systems comprising two or more dynamo electric machines connected in parallel in which at least one of said machines is a rotary converter or other apparatus to which alternating current is furnished.

The-object of my invention is to provide means which will respond very readily to tribution of load between such machines.

According to my invention I provide means controlled by the relative currents flowing in t e armature leads of the respective machines for varying the voltage of the alternating current which is supplied' In the present application I specifically disclose my invention in connection with a system comprising a rotary converter in The said rotary converter is provided with a well known induction feeder regulator which comprises a stationary coil, a rotatable coil and means for rotating the latter so as to vary the angular displacement-of the same with respect to the stationary coil and thus to lower or boost the voltage of the alternating current supplied to said rotary apparatus I provide means controlled by' the relative current flow in the armature ling the direction of motion of the means for rotating the said coil. ,Thls means conmaking arm which is adapted to engage one of two contacts to complete the circuitin a given direction, or to assume a position between the said two contacts in which case the circuit is broken. l The said circuit may include. any suitablev means for rotating the regulator coil such as a motor. The contacting lever is connected to a core which is 'controlled by a pair of coils each of which is in series with an armaturelead of one of the machmcs and which are so disposed as to have opposite elects on the said core. In

connection with the said core I have devised.

an im roved means for overcoming the'effeet o ravity upon the same so that the said core w1 'l readlly respond to variations in the relative currents owing in the respective armature leads. This means comprises a pair of oppositely'disposed coils which are connected in shunt with the mainline and .which are so proportioned that the effect of the lower coil is suliiciently greater than that of the upper to neutralize the effect of gravity upon the core.

My invention will bemore clearly understood by referring to the accompanying ldrawingin which a system embodying my invention is shown diagrammatically.

Asshown in the aforesaid' drawing, the

armature 10 of a direct current generator is connected through leads 11 to the mains 12.

VThe said generator is shunt wound having through mains 19. A lportion of the current from the armature 10 passes to the coil 2O through lead 21, a suitable resistance 22 being included in the armature lead for this purpose. The armature lead of the rotary converter is also provided with a suitable resistanceI 93 causmg a portion of the current to pass through the conductor 24 vto the coil 25. The coils 20 and 25 are oppositely wound `and surround 'the cores 26 and 27 which are rigidly connected by the bar 2S. The coils 29 and 30 are connected in shunt with the mains 12 by means of conductors 31, a suitable resistance 32 being included in the circuit. The resistance of the upper coil 30 is such relative to `thatof coil 29 (as indicated by the resistance 55 included in the circuit of coil 30) that when the coils are energized the effect of the weight of the coresl 26, 27 and the attached parts is just overcome thus casin the position of the said cores to be determined solely by the currents' flowing in the coils 2O and 25. The core 27 is connected to one end of the lever liti ' 33 which is pivoted at 34. The other end ot l plied to the rotary converter to' increase and thev saidlever is disposed between the contacts 35, 36.' s

37 is a reversing relay of a well known type. This relay is energized through the leads 38 which are connected across the leads 3 9 of a transformer 40, the primary of which is connected across the alternating current supply mains. The eld ofthe reversing relay comprises two coils 41 and 42 and the exciting current from the leads 38 pass through one or the other of the said coils depending upon which of the contacts 35, 36 is engaged by the lever By this means the direction of rotation of the armature 43 o is controlled. Attached vto the armature is the switch arm 44 which comprises the sections 45, 46 which are insulated from each other. Contacts 47 and 48 are4 disposed on opposite sides respectively so as to be engaged bythe switch arm at opposite ends of its swing. Certain of these contacts are connected to the leads 39 and the remainder With the leads 49 which are connected to the operating motor 50 of the induction regulator 51. The said'induction regulator and the mechanism connected therewith are well known in the art. The regulator comprises a stationary coil and a rotary coil, a motor for rotating the movable coil and a limit switch (not shown) for breaking the circuit when the `movable coil has reached the maxibecomes greater than a predetermined Value for which the apparatus-is set, the increase in current flowing in the coil 20 will cause the core and the connected parts to be attracted downwardly. This will cause the lever 33 to engage the'contact 35 which will energize the relay 37 so as to cause the motor 50 to turn the movable coil of the induction regulator 51 vtoward its maximum'boosting position. This willcausethevoltage supwill cause the machine to assume itsproper 55 share of the. load. 0n the other hand should the rotary converter assume too much of the load the eect will be to cause the lever 33 to assume a neutral position or to engage the contact 36. In the neutral position the eect will be to stop the motor 50 and -therefore to bring the movable coil of the regulator to a stop'. The effect of the engagement of the lever 33 with the contact 36 will be a reversal of the motor` 50 so asto cause the mov- 65 able coil of the regulator lgto move toward the maximum lowering position. This will cause the voltage supplied to the rotary converter to drop and thereby cause the machine to take less of the load.

Various modications oit4 the apparatus and system above described will readily suggest themselves tothose skilled in the art and are to be considered as coming within the scope of my invention which vis 'set forth 75 in the following claims.

What I claim as new and desire to secure by Letters Patent of the United States', is

1. A system comprising dynamo electric machines connected in parallel in which at least one of said machines receives alternating current, and means for regulating the voltage of said alternating current according to the relative loads on the said machines.

2. The combination of a direct current .85 generator connected inparallelI with a ma chine receiving alternating current` and furnishing direct current, and a regulator for said alternating current having a stationary coil anda movable coil and means controlled by the relative loads on said generator yand said machine for determining the position\ of said movable coil. v

3. The combination of a rotary converter and a direct current generator connected in parallel and of means for varying the voltage ofthe alternating current supplied to said converter according to the ratio' of the loads o n the said converter and the said gen-y erator. f l

In witness whereof, I have hereunto set my hand this 1st day of October, 1912.

HARRY A. LAYCOCK.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. y 

